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Date:         Sat, 10 Oct 2009 10:51:08 -0700
Reply-To:     neil n <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil n <musomuso@GMAIL.COM>
Subject:      Warm Start Issue Likely Solved (+ temp sensor test results)
Content-Type: text/plain; charset=ISO-8859-1

Hi all.

On my Vanagon w/Jetta 2.0, I was having intermittent warm start problems that would cause engine to take 5+ cranking sessions to start. When started, it was sometimes rough, but would always feel "flooded" when trying to start it. Recently, it would also "hunt" at idle when restarted in hotter ambient temps. Being a DIY conversion, was concerned problem might be due to an intermittent wiring flaw or ?. Seems not.

The suspect temp sensor bench tested out of spec mid range. This coincided with what I saw at coolant temp gauge when hard to start warm. In hindsight, this made total sense. The sensor was very likely telling the ECU to make the mix too fuel rich (Thanks Scott for the tip on that)

Currently a used VW branded temp sensor is installed. No warm start problems so far, and no more error codes found in the OBD.

Posting this as the ECU portion of sensor is basically the same as the ones used in the WBX engines. Also posting as I tested a new FLAPS "Standard" made in China sensor. Bought this as VW wanted $54 Cnd., had to order it, and to my mind couldn't guarantee it would be OEM. Besides. Figured I'd test something I'd likely stand a better chance of finding out in the middle of nowhere.

Results below. Seems the new sensor is close to out of spec mid-upper range. This might be due to my test methods though.

Neil.

No Name VW FLAPS "Standard" brand

21C 2900 Ohms 2300 Ohms 2500 27 2440 1920 2000 32 1940 1550 1600 38 1656 1300 1200 43 1360 1070 970 49 1130 890 780 54 932 750 620 60 780 640 510 66 666 530 420 71 555 450 350 77 470 380 290 82 400 325 247 88 337 278 222 93 286 240 215 100 217 194 204

-- Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines


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